-I agree that nobody is perfect but I don't see how that makes Nietzsche's theories impossible...
-Dostoevsky did realize the failure of 19C Western thought, but so did Nietzsche!
-Lastly, I guess we would have to aruge over what "the limitations of makind" are but I think that Nietzsche does this just as much as Dostoevsky did.
The Ubermensch isn't someone who goes beyond the limitations of mankind, he is someone who realizes the totality of his limitations, and embraces them.
I knew I shouldn't have brought Nietzsche up on this topic

... anyways, back to the Dostoevsky and the Imagination!